Malicious PDF — malware analysis report

Static analysis result for SHA-256 227773c7872d9467…

MALICIOUS

PDF

88.6 KB Created: 2021-09-01 11:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5984391ffa38167f313d6c847af95302 SHA-1: 7a5e394626429059592148f356d5ffe58bb83c59 SHA-256: 227773c7872d94678fac154f7ed7c0a6a9af03e6de45cc0e16dc75b5047bb240
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/12074432077.pdf In PDF document text
    • http://alemotta.com/resources/original/file/15184793647.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/86740881673.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d95b18a2351f7488cd4d1888d02b0116/92298483865.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/jivinizub.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe2525513a---wubufo.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/f770a67ba88ec528bd91871a1eaa0e0e/44223138613.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/83693969902.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/wixisegowez.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/rirolelozidanufenigifu.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607072d09c458---xuvuvolamapoxumeso.pdfIn PDF document text
    • http://drlalashow.com/php/billboard/uploads/file/16426934694.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/632e3f8e694beb36e5d732b779cbae33/9395870020.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/91613601968.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/2r53c86mlq0qsqrmdgglr3smlo/52465030450.pdfIn PDF document text
    • http://accronline.com/userfiles/file/61601826784.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/ea15f273cde92fcca605c9fd4faf5ddd/velegapelovopoxawos.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/71493144158.pdfIn PDF document text
    • https://beaszemin.com/files/52114759416.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/70555588071.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/5eh8rsb6applicq00bosgh2pr4/49821406467.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ca6551d79---wotunimekemumesuvefuz.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/h74c1k6ih0j8c9vsuo7rvks7r8/mewinu.pdfIn PDF document text
    • http://standdominica.org/files/files/vunavafulinirugojowonuwuk.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/5d6952daaef882960b4da2208fb5517b/reranafugowovamizogalov.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/fukekizipukag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=translate+afrikaans+to+englishPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A3 17972 bytes
SHA-256: 1da825fea09e5bd60d31f2e48aaacc91a8cf57d08c9416c75a88c8d8744dcb54
font_01_sfnt_off00012324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12324 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3B 10548 bytes
SHA-256: 13c9efe1592e36075d6fcc6a6466636d1dd8971b7ac4659a6cd4164729d0f309

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